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I just picked up a 2005 LGT Limited, 5 speed manual on monday from a very reputable local used car dealership. ON tuesday i threw a P0302 Code for misfire in cylinder 2, had it fixed on thursday under the dealerships waranty and they replaced the spark plug and coilpack for that cylinder. I picked the car up that night and now (friday) i still feel a random rough idle. It seems to feel like a miss fire because idle will be fine then give a small harder hit and repeat every minute or so, I do not feel any hesitation in the throttle when driving and it feels perfectly fine, only when im at a dead stop it get that random higher hit. Also the car is bone stock. I was thinking about replaceing the other 3 coils and sparkplugs, but looking to see if anyone else has an idea of what it could be.

No codes now though? How many miles are on the car/the spark plugs that are in there? Spark plugs would be an easy and cheap thing to try, and if they are bad, it would make sense if it isn't throwing a CEL anymore.

Well if the code is still being thrown, why did they give you the car back? Or did it come on after you got it back? If it is under warranty and the code is still on, I wouldn't waste any of your own time trying to diagnose it. Take it back and have them fix it right, that's what the warranty is for.

Code came on after i got it back, and its one of those 30 day warranty things from a used car dealership and the dont seem to do the best work just throw something in hope it fixes it and call it day, so i want to know for my own satisfaction

Had an 05 legacy gt automatic had same problem as u. took it to the dealer changed the spark plugs little after got it back did the same thing took it back n they had to change the whole fuel injecter system lucky had the factory warr

Well compression test done and all 4 cylinders read 120Psi. Swapped out a new injector into cylinder 2 and bam, problem solved. =) Glad to have gotten the car back last night with no issues, running much better than before, good thing they did all the work under waranty. Almost a grand after parts and labor!! (They charge $99/hour labor...)